Phonograph.



D. W. ALLIS a l. B. MILLET.

PHONOGRAPH.

APPLlcAUoN FILED APR.17, 1912.

Patented Feb. 1, 19H5.

Lwmee.

` narran sierras DEXTER W. ALLIS'.. OF WHITMAN, .AND JOSEAH B. MILLET, OF BOSTON, MASSACHU- SETTS, ASSIGNORS TO BOSTON TALKING MACHINE COMPANY, OF BOSTON, MAS SACHUSETTS. A CORPORATION 0F MAINE. v

PHONOGRAPH.

Application filed April .1.7, 1912.

To all lwhom it may Concern.

3e it known that we. DEXTER W. ALMS and JosLxH B. MILLET, citizens of the United States, and residents ot l/Vhitman, county or Plymoutln and Boston, county of Sutfolk, respectively, State of lvl'assachusetts, have invented an Improvement in Phonographs, of which the following description, in connection with the accompanying drawings. is a specification. like characters on the drawings representing like parts. rl`his invention relates to phonographs, and among other objects provides a sound reproducing mechanism which is cheap to manufacture and is simple in construction and operation.

The character of the invention may be .best understood by reference to the following description ot an illustrative embodiment thereof shown in the accompanying drawing, wherein:

Figure 1 is a side elevation of an illustrative phonograph embodying the invention; Fig. .2 on an enlarged scale is a vertical section through the sound reproducing mechanism and amplilier; Fig. 3 is an end elevation looking toward the right oi Fig. and lig. Il is a, vertical section through the sound producing mechanism on a larger scale than that shown in Fig. i2.

The illustrative sound reproducing mechanism shown herein as embodying the invention comprises a diaphragm 5 (Fig. 2) of metal or other suitable material conveniently formed in one piece with the sound box shell 7 from a piece of cup shaped material. The back ot the sound lboi; is closed by a perforated backing disk 9 of wood or other suitable material, the shell 7 having a portion flanged or clenched over said disk. A stylus bar 11 is provided of resilient Wire or other suitable material and one end thereof is attached to the sound box separate from the diaphragm as by fitting said end into-rt-:gistering` holes in said cup and disk. lhe wire bar is arched outwardly from said sound box, thence inwardly toward the center ot' said diaphragm and then is bent away from l@he latter to present a bend or bight 13 for engagementwith said diaphragm. T he tree end of said bar carries a stylus l5 herein inthe form of the sapphire point usually employed. To maintain said bight and diaphragm in` intimate cf-atct so that Specification of Letters Patent.

Patented ses. i, isis.

Serial No. 691,307.

vibrations ot one will be transmitted to the other, they may have provision for pressing them toward one another. To this end the diaphragm, instead of lying flat against the disk 9, is formed to tend to bulge away therefrom as well shown in dotted lines in Fig. 4. The stylus bain on the other hand, by its arched torni and inherent resilience presses its bight against said diaphragm and tends to Hatten said diaphragn'i somewhat from its dotted position which the inherent resilience thereof would cause it naturally to assume. As a result, they are pressed firmly together and any vibrations of one are transmitted to the other.

Byproperly proportioning the opposed pressures Yof the stylus bar and diaphragm, conditions of high sound. reproducing etliciency are obtainable.

in view of the ,tactthat the weight oi.E the sound reproducing mechanism is borne principally by the stylus bar and in view ot' the shape and relation of said bar to the sound box, in use the bar will automatically tend to bend and press aga ..-t the diapl'iragm. Hence the work ot' the arched spring cit the bar in maintaining Contact ot the latter with the diaphragm will be lessened-and theretore the spring may be made weaker than if this gravitational effect were absent.

The diaphrr-ign'n owing to its bulged form, does not require any supplemental means :tor pressing the same toward the stylus bar such as might lessen its vibratory effectiveness. 'lo locate or position the place of contact of said stylus bar bight with said diaphragm, the latter'may be scored or other- Wise shaped to present elevations 17 forming between them a seat for receiving the bight of said bar. l

A suitable sound amplifying device is provided herein shown as a horn 19 connected to the sound boX in any suitable manner as by a neck 21 thereof. Since the backing disk of the sound box is thick land massive, it is substantially non-vibratory and all the sound from the sound box passes to the `horn.

,The sound reproducing mechanism and amplitier may be supported in any suitable manner. As shown herein. an arm 23 is provided projecting'laterally away from a usual record table base l and supports at its outer end an upright post 25 projecting up through an aperture 27 lin the lower side of the horn and through an elongated aper- "ture 29 in the opposite side of the horn.

I the stylus side of said post and will be sutiicient to cause the stylus to properly engage and travel along the record. In some instances the Weight may be increased as by a lead Washer 33 secured to said sound box in any desired manner.

By our invention the phonograph sound reproducing mechanism is reduced to its simple fundamental elements and Without sacrifice in sound reproducing efiiciency. It will be observed that in accordance with the construction shown the diaphragm is directly connected to the stylus by the bar ll 'and there are 'no joints in the connection susceptible of play, lost motion or other disturbances such as would tend to interfere Withv the accurate transmission of the vibrations, from one to the other, but on the contrary the vibrations are accurately transmitted in a highly eiective manner.

While there is shown herein for the purposes of illustration one specific embodiment of vthe invention it is te be understood that the same is not limited thereto, but that extensive deviations therefrom may be made Without departing from the spirit of' the in vention.

- What We claim as new and desire to secure by Letters Patent is:

1. In a phonograph, the combination of a cup shaped sound box formed to present a bulged resilient diaphragm integral therewith, a vdisk in said box, and an integral stylus bar fast to said boX and formed to present a bight for light engaging contact with said diaphragm.

2. In a phonograph, the combination of a sound box having a bulged -side forming a diaphragm and a resilient stylus bar having one end fast to said box and a stylus at its opposite end, ysaid bar being bent intermediate its ends to present a bight for engagenient with said diaphragm.

3. In a phonograph, the combination of an integral cup shaped metal sound box formed to present a diaphragm, and a stylus bar comprising a rod having an end secured to said box, an end for connection with a stylus, and a part formed to present a portion separate from but engaging said diaphragm. l

Ll. In a phonograph, the combination of a cup shaped sound box formed to present a resilient diaphragm, an apertured disk Iin said box substantially filling the same, and a stylus bar having an end fast to said disk and an' end rigidly connected With a stylus,

a portion of' said bar being adapted to engage said diaphragm, theresilience of said diaphragm serving to urge the `same toward said bar. i c

In testimony whereof, We have signed our names to this specification, in the presence of tivo subscribing Witnesses.

` DEXTERWV. ALLIS.

JOSIAH B. MILLET. 1Witnesses for Dexter IV. Allis:

ROBERT I-I. KAMMLER, F. IRENE CHAxnLEn. YVitnesses for Josiah B. Millet:

THOMAS B. BOOTH, ROBERT I-I. KAMMLER. 

